AAST lung injury scale

Grade*	Injury type	Description of injury
I	Contusion	Unilateral, <1 lobe
II	Contusion	Unilateral, single lobe
II	Laceration	Simple pneumothorax
III	Contusion	Unilateral, >1 lobe
	Laceration	Persistent (>72 hours) air leak from distal airway
	Hematoma	Nonexpanding intraparenchymal
IV	Laceration	Major (segmental or lobar) air leak
	Hematoma	Expanding intraparenchymal
	Vascular	Primary branch intrapulmonary vessel disruption
V	Vascular	Hilar vessel disruption
VI	Vascular	Total, uncontained transection of pulmonary hilum

AAST: American Association for the Surgery of Trauma.
* Advance one grade for bilateral injuries up to grade III. Hemothorax is scored under thoracic vascular injury scale.

Reproduced with permission from: Moore EE, Malangoni MA, Cogbill TH, et al. Organ injury scaling. IV: Thoracic vascular, lung, cardiac, and diaphragm. J Trauma 1994; 36:299. Copyright © 1994 Lippincott Williams & Wilkins. Available at: https://www.aast.org/resources-detail/injury-scoring-scale (Accessed on December 10, 2019).

Graphic 121568 Version 5.0

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AAST lung injury scale